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gulfjack wrote:I have seen so called distilled water which was treated by reverse osmosis when I read the fine print. I always look for the fine print that says steam distilled.

Is it really clear that it's RO water, and not distilled despite being labeled as "distilled?" I'd really love to see a photo of that label. I guess it's possible the government allows such fraudulent labeling, but I haven't seen a good source showing they do.

It's possible that some water is run through RO first, then distilled. There are several reasons they would do so, but a big reason would be that doing RO first would prevent scale buildup on the boiler part of the still.